Mavericks' strange power button behavior.
I have MacBook Air 2013, Mavericks installed and I know that power button's behavior has been changed in Mavericks.
I wanted to pop up the old system shutdown menu. Thus, I tried to press power button for 3 seconds.
However, my MacBook Air doesn't allow me to do that. It immediately goes into sleep mode as soon as I put my finger on the power button.
Then, I press power button again to wake it up. After that meaningless and redundant actions, pressing power button for 3 seconds does work.
On the other hand, the alternative method, pressing Control + Power Button always works.
MacBook Air (13-inch Mid 2013), OS X Mavericks (10.9)